DHCP Server

© N. Ganesan, Ph.D.

Reference

DHCP Server

• Issues or leases dynamic IP addresses to clients in a network

• The lease can be subject to various conditions– Duration– Computer ID etc.

IP Address Assignment

• The DHCP server assigns or leases a client an IP address for a predetermined period of time– In most cases, the IP address is automatically

renewed when a clients logs into a network• The IP address assigned is taken from a

pool of IP addresses defined as the scope of IP addresses available for assignment

• A user can manually release and renew an IP address by typing the commands "ipconfig /release", followed by "ipconfig /renew" in the command prompt

Assignment Conditions

• IP addresses can be reserved for clients based on MAC addresses and host names

• For security, the lease of IP addresses can be restricted to clients with known MAC addresses

DHCP Server in a Network

Initiating the Installation of the DHCP Server

• User the Manage Your Server wizard and select the DHCP server option for installation

Name and Description of the DHCP Server

Address Range and Subnet Mask Specification

IP Address Exclusions

Exclusions

• Some IP addresses may be excluded so that they could be reserved for assignment to servers as static addresses– Servers, in general, requires the assignment

of static addresses – The router address is also normally excluded

• Specific or a range of IP addresses may be excluded in this manner

Lease Duration

Guideline on Lease Duration

• Shorter leases for mobile devices such as laptops

• Longer leases for permanent devices such as desktops

Configuration of DHCP Options

Default Gateway Address

Domain Name and DNS Server Address

DNS Specification

• DNS IP address can be specified manually

• DNS IP address can also be resolved by entering the server name and pressing the “resolve” button on the screen

WIN Servers

Scope Activation

Further Configuration of DHCP

Further Exclusions

Exclusive IP Address Reservation for Clients

Reservation Basis

• Reservations are based on MAC addresses

The End